Brake-shoe back.



C. W. PRMBRUST.

BRAKE SHOE BACK.

APPLICATiON FILED JAN.3, 1916.

1 1 383, Patented Dec. 26, 1916.

3 SHEETS-SHEET I.

C.- W. ARMBRUSI.

BRAKE SHOE BACK.

APPLICATION FILED JAN-3.1916.

3 SHEETS-SHEET 2 Patented Dec. 26, 1916.

C. W. ARMBRUST.

BRAKE SHOE BACK.

APPLICATION FILED JAN.3, I916.

Patented Dec. 26, 1916.

3 SHEETSSHEET 3- z (72 7ZZ as a ..: LES W. ABM BBUST, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO'THE AMERICAN BRAKE SHOE & FOUNDRY COMPANY, OF WILMINGTON, DELA- WE, A COBPOTION OF DELAWARE.

BRAKE-SHOE BAG To all whom it may concern:

Be it known that- I, CHARLES W. ARM.

- back which will result in an increase in the wearing qualities of the shoe and permit its use until the shoe has been worn to its. last possible state of usefulness, and which will also hold the parts .of the shoe in their proper position with relation to each other,

should the same at any time become broken before the shoe has completely served its entire purpose.

Another ob ect of the invention is to produce a back from a blank punched or otherwise formed of sheet metal which results in that a thinner metal may be used which will permit the same to be bent to the desired.

form and produce a keyway for the key which secures the shoe to the brake head.

A further object is to form apertures through which the metal of the shoe may pass to form a means whereby the shoe and back are held together. The blank is further designed to produce portions which may beembedded in the shoe proper and which form a means whereby said shoe and-the back are further held together. A furtherobject is to produce these and other advantages in asimple, eflicient and inexpensive manner without resulting in a corresponding reduction of efficiency, and

requiring no special machinery for its production.

I will explain the invention by referring to the accompanying drawings, in which Figure 1 is a view partially in section of a brake beam and head showing the relative position of a shoe having my improved back applied thereto; Fig. 2 1s a front view of a shoe having a construction similar to that shown in Fig. 1, and showing my improved back applied thereto; Fig. 3 is a transverse section on line a-a of Fig. 2; Fig. I is a plan view of a blank of which one form of Specification of Letters Patent. Patemtedm 25, jgjgfi Application flled January 3, 1916. Serial No. 70,017.

the back may be formed; Fig. 5 is a detail view of the back separated from the shoe and bent to'form a back from the blank shown in Fig. lyFigs. 6, 7 and 8 are plan v1ews of modified forms of construction; Fig. 9 is another modified form of construction in which the extreme ends of the back are provided with means against which the ends of the brake head may rest; Fig. 10 shows a brake shoe provided with a back having the construction shown 'in Fig. 9 and showing the ends of the brake head cooperating therewith; Fig. 11 is a transverse section of a brake shoehaving a back applied thereto of a construction similar to that shown in Fig.7 Fig. 12 is a transverse section of a brake shoe having a back applied thereto similar to that form shown in Fig. 8; Fig. 13 is a transverse section of a brake shoe showing a modified application of the form of construction shown in Fig. 8; Fig. 14: is a transverse sectionof a brake shoe showing a keyway entirely embedded in the metal of which the shoe is formed;

Figs. 15, 16 and 17 show several ways in which the back may be positioned and held with relation to the shoe, for instance, Fig. 15 illustrates the back as entirely embedded in the shoe with the exception of the portion which forms the keyway, the remaining views illustrating the same portions of the back partially mounted within the shoe and wholly outside of the metal which forms the 'shoe. Fig. 18 is a modified form of construction, in which the construction of the side edges of the plate are entirely relied upon to produce the means whereby the back is secured to the shoe; Fig. 19 is another modification, showing an arrangement whereby the thickness of the shoe is slightly increased to accommodate the means which serve to.secure the back and shoe together.

Referring more particularly to Fig. 1, I show a brake shoe having my mproved back applied thereto, and also illustrating the shoe as applied -to abrake beam and head and showing the-ordinary manner of securing said shoe in position with relation to the brake head.

Referring more specifically to the parts shown in Fig. 1 I show a brake beam 18 which carries the brake shoe head 19, the key 20, and a shoe 21 having my improved back 22 applied, and carried by the head.

As before stated, the back is preferably formed of a blank punched or otherwise formed of thin metal. This blank is generally designated 23 and particularly shown in Fig. 4. As shown, th1s blank is comprised of the side members 24 and 25 and the transversely arrangedportion 26. The portion 26 is designed to be bent outwardly upon lines 2727, 2828, and when bent forms a keyway 29 for the key 20 illustrated particularly in Fig. 1. It will be noted that when the keyway is bent as illustrated, the openshoe and ,head together.

ing provided thereby through which the key 20 is passed is arranged so that its sides and top are parallel with the body of the shoe, thereby resulting in greater strength and stability of this'part 29 by virtue of the fact that the same is connected throughout its whole length with the portion which forms the brake shoe back. It will be further noted that the, blank 23 is provided with the cut-away portions 30 and 31 pro- ,vided at each side of the portion 26of which i the keywa 29 is formed.

By referring particularly to Fig. 2 it will be noted that the shoe is provided with the raised portions 33, 34 and 35, which form seats against which the brakehead 19 may rest. It will be further noted that lugs 36 and 37 are also utilized which areprovided withthe cut-awayportions '38 and permit the key 20 to be positioned to hold said These seats and lugs will-be found in all shoes constructed in accordance with, the usual M. C. 13. standard'type of shoe Itwillibe noted that the back is embedded at both ends and in the "ta-nee beyond the shoe. key 20 to'be readily passed therethrough to .middlein these seats, the'r'emaining portion of the back bei g Partially embedded in said shoe. It will further be noted that the member 29 protrudes a considerable dissecure the brake shoe in position upon the head. i S In the form shown in Fig. 7, the side edges I of the-brake shoe and theedges of the aperture 32 are shown provided with the beveled portions 39. This feature is also illustrated in Fig. 11 from which it will be evident that the members similar to those designated by the numerals 24 and 25 will be substantially wedge shaped in 'cross section. The smaller portion of the-wedge formed by this con This permits the struction will preferably be faced toward the outer portion of the shoe and be embedded in the body portion of the shoe, thereby greatly decreasing the possibility of separation occurring between the parts to which the back is applied.

In the construction shown in Figs. 8 and '12, the side edges of the back only are beveled and the members 24 and 25 are provided with lugs and recesses 40 and 41, the lugs being preferably of a length which when bent downwardly will extend into the "metal of the shoe only a distance equal to the thickness of the metal of which the back is formed. In this form of construction said lugs form the holding means whereby the shoe and the back are held together.

. In Fig. 13 I contemplate the use of a con' struction which is similar to that shown in Fig. 12, differing only in that the back is shown as being embedded in the shoe and having beveled side edges. Lugs similar to those shown in Fig. 12 are also utilized to prevent the shoe from becoming separated from the back.

V Figs. 9 and 10 illustrate another form of construction which my invention may take. In this form lugs 42 and 43 and the raised portions 44, 45 and 46 are all produced in the metal of which the back itself is formed, which form portions against which the brake head may rest. The purpose of the lugs 42 and 43 is illustrated m Fig. 10. The raised portions 44,45 and 46 produce seats against which the faces 47 'and 48 of the brake head may be placed when the shoe is "applied thereto. In this form the back will be provided with the forked ends 49 and 50and the portion 45 will extend completely across to the side edges of the metal of which the back is formed, and the-lug 29 will be formed inthis intermediate portion 45. This construction permits the portion of the members 24 and 25 between the portions 44 and 45, and 45 and 46, to be 'embedded in said shoe and the metal of the shoe permitted to flow into the recesses formed by the raised portions 44, 45 and 46, and thereby produces coiiperating shoulders and recesses which will hold the back and shoe together.

.the back as indlcated at 51. This will cause the back to resemblea wedge in cross section, which when embedded in the metal of the shoe, will prevent its separation therefrom.

. In the form illustrated in Fig. 19 the shoe will be provided with an offset portion 55. This ofiset will correspond in thickness to the length of the lugs 56, which form the i,aio,ess i separation. By this arrangement the usual thickness of the shoe itself will be slightly increased, but will result in producing a shoe having the same wearing surface as ordinarily, minus the possibility of scoring the tread of the .wheel which might be caused by projections or lugs 56 when the shoe has been worn to this point.

It will be evident from the foregoing that the back may be formed of substantially thin metal and that a means is produced whereby the parts are securely held in place with relation to each other, andalso that the construction herein shown produces a means whereby the parts are securely held together even though the shoe should become brokenfrom any cause before it has served its entire purpose, and before it has been reduced to a state of uselessness fromwear. Also that a means may be easily formed for holding the brake head and the shoe against any lateral movement with relation to each other, all of which may be accomplished in a comparatively cheap manner without resulting in a consequent reduction of efficiency.

Having thus explained my invention, what I claim as new and desire to secure by Letters Patent is:

1. A brake shoe back comprising a plate plate.

which is constructed to be bent to form a holding member and to produce apertures therein when bent, said apertures forming a meansthrough which the metal of said shoe maypass to form a means whereby said shoe and back-are held together, said apertures and said holding member being formed from a blank which is composed of laterally separated recessed portions and a member which extends across and connects said laterally separated members, which when bent causes the recessed portions to be brought to ether and form said apertures.

2 A bra e shoe back comprising a plate having recessed portions, said plate being constructed to be bent to form an apertured projection to receive a key, said recessed portions forming an aperture when said plate is bent through which the metal of the shoe may pass to secure said shoe and back together, and downwardly extending strengthening ribs atthe side edges of said In witness whereof, ll hereunto subscribe my name this 16th day of December, A. D,

C a. Y: W. ARMBRUST. Witnesses:

HAZEL A. Jonas, Max W. ZABEL. 

